TY  - JA
AU  - Wiersum,L.K.
TI  - Problems in soil fertility characterization by means of plant nutrient requirements
SN  - 1573-5036
U1  - 82-765113 
PY  - 1981///
KW  - Fertilizers
KW  - AGROVOC
KW  - Soil fertility
N1  - 36 ref.; Summary (En); Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0032-079X
N2  - In this discussion an attempt is made to consider the extent to which rates of uptake by roots, as established in plant physiological research, can be used as supply rates towards the roots in the soil system. Multiplying measured total root length or surface in the field with rates of water influx gives amounts of water use that are usually somewhat higher than those actually occurring in the field. This may be due to the fact that the level of activity of older roots is unknown and cannot be taken into account. The high influx values of mineral nutrients obtained in physiological research can only be used if we can delineate the size and location of the actively absorbing root surface, define the actual soil-root contact and obtain more information on activity variations of roots during periods of stress
T2  - Plant and Soil
ER  -